patternrevision history
Respond to Local Precipitation
Solution
In areas that receive a lot of rain, provide outdoor spaces with shelter from the rain.
Supporting Patterns
In areas that receive a lot of snow, a roof must be designed to support the weight of any snow buildup that is likely to occur.

It is therefore natural to design roofs that will shed snow easiliy. This can be accomplished by using high roof pitches (10:12, 12:12 or even greater) and/or using roofing materials with lower friction, such as metal roofs.
more 
Except where otherwise noted, this work is shared under a Creative Commons License